A solid-state instrument for measuring dynamic changes in the pupil of the human eye

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Instrumentation

Background:

• Accurate measurement of human pupil dynamics is crucial for understanding visual function and neurological conditions.
• Existing methods may lack precision, especially under varying light conditions.

Purpose of the Study:

• To describe a novel instrument for dynamic human pupil diameter measurement.
• To detail the technological components and performance characteristics of the device.

Main Methods:

• Utilized a 100-element linear self-scanning photodiode array and a Z80A microprocessor.
• Employed infrared radiation for eye imaging.
• Implemented microcomputer compensation for photodiode array non-uniformities.

Main Results:

• The instrument provides accurate analogue and digital outputs of pupil diameter, exceeding +/- 2.5% of full scale.
• System accuracy and reliability are maintained at low irradiance levels.
• A method for a two-dimensional measuring system was proposed.

Conclusions:

• The developed instrument offers a reliable and accurate method for dynamic pupil measurement.
• The system demonstrates robust performance across different irradiance levels.
• The proposed two-dimensional extension could enhance diagnostic capabilities.